<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
<script type="text/javascript">
    // const a; // 报错
    const team = ['a', 'b', 'c'];
    team.push('d');
    console.log(team); // ['a', 'b', 'c', 'd']
    // team = 1; // 报错
</script>
</html>